george h



(No Model.)

G. W. BORROWE & G. H. WINSLOW.

No. 586,417. Patented July 13,1897.

IIVINTORS:

UNITED STATES PATENT OFFICE.

GEORGE IV. BORROlVE, OF BODIE, CALIFORNIA, AND GEORGE H. lVINSLOl/V, OFPITTSBURG, PENNSYLVANIA.

CAM.

SPECIFICATION forming part of Letters Patent No. 586,417, dated July 13,1897.

Application filed March 22, 1894. Serial No: 504,607. (No model.)

To all whom it may concern.-

Be it known that we, GEORGE IV. BORROWE, residing at Bodie, in thecounty of Mono and State of California, and Gnonen IIJVINSLOVV, residingat Pittsburg, in the county of Allegheny and State of Pennsylvania,citizens of the United States, have invented or discovered certain newand useful Improvements in Cams, of which the following is aspecification.

The invention described herein relates to certain improvements in cams,especially to that class or kind employed for operating the stamps in astamping-mill. These cams are usually made of cast iron or steel andbecome worn and flattened at the point or highest portion, so that thestamp is not raised to the required height, and a considerable increasein power is required to operate the stamps on account of the increase ofthe angle of impact of the cam against the tappet. Hence it is necessaryfor an economical operation of the mill that the cams should be removedas soon as they become worn to any considerable extent and a new oneinserted.

As the stampingmills are usually constructed a series of these cams arekeyed on the same shaft. Hence in order to remove a worn cam it isfrequently necessary to remove two or more which are in good condition.This operation requires considerable time and labor and the driftways inthe shaft are liable to be injured, thus necessitating their repair.

The object of the present invention is to construct the cams withremovable wearingfaces or shoes which can be easily and quickly removedand new ones placed in position without removing any of the other camsor their shoes. In general terms the invention consists in theconstruction and combination substantially as hereinafter described andclaimed.

In the accompanying drawings, forming a part of this specification,Figure 1 is a view in side elevation of aportion of a double cam havingour improvement applied thereto. Figs. 2, 3, and at are similar viewsillustrating certain modifications in the means for securing the innerend of the shoe to the cam. Figs. 5 and 6 are transverse sections of thecam, illustrating different means for holding the shoes as againstlateral movement; and Fig. 7 shows perspective views of the outer endsof the cam and shoe.

In the practice of our invention the cam, as regards the wings 1, isconstructed in the usual manner, having broad bearing-faces andstrengthening ribs or webs 2. The shoes 3, which are preferably formedof steel, are provided with hooks 4:, adapted to engage the points ortoes of the cam, such hook portion being slotted to pass on oppositesides of the webs 2. In order to prevent any straightening of the hooks,ears 5 are formed on opposite sides ofthe web and project over the endsof the hooks. on the web for holding the ends of the hooks in positionholes 6 may be formed through the prongs of the hooks and pins 7 passedthrough said holes and a correspondingly-located hole in the webs.

In the construction shown in Fig. 1 projections 8, having hooks or lugsat their outer ends, are formed on the hub of the cam, and the innerends of the shoes pass between these projections and are held inposition by wedges 9, passing between the outwardlyturned ends of theshoes and the projections and also between the shoes and the hooks orlugs on the projections. By driving the wedges in the shoes are not onlyheld firmly against the faces of the cams, but drawn tightly along suchfaces. In case of any stretching of the shoes the wedges may be drivenin farther, thereby causing the shoes to again hug the faces of the camtightly.

In the construction shown in Fig. 2 the bent ends of the shoes engagethe ends of a bar 10, passing transversely across the hub of the cam andbetween pins 11, inserted in holes in the hub. By making these pins withwedge-like heads the shoes maybe drawn tightly against the faces of thecam.

As shown in Fig. 4, the inner ends of the shoes are bent so as to beprojected into recesses formed in the wings 1 near their junction withthe hub and the shoes caused to fit tightly against the 'faces of thewings by wedges 12, arranged in grooves in the wings transversely of theends of the shoes.

In the construction shown in Fig. 3 the In lieu of employing ears shoesare drawn firmly against the faces of the cams by a wedge-like pin 13,passing through the shoes and the wings 1. The holes through the wingsand shoes are made somewhat larger than the wedges, so as to permit theWedges to be driven in, and the holes in the shoes are so located withreference to those in the wings that when the wedges are driven in theshoes will be drawn tightly against the faces of the wings. The pin 13is held in position by a key or cotter 14, which is made in the form ofa wedge, so that by driving in the cotter the pin 13 may be drawn in. Inorder to provide a firm bearing for the key 14, a washer 15, having oneface shaped to fit the curved surface of the cam, while the oppositeface is made straight, is interposed between the key and cam.

As shown in Figs. 5 and 6, the shoes may be held from lateral movementon the faces of the wings 1 by ribs 16, formed along the edges of thewings, or by a single central rib, the under faces of the shoes beinggrooved for the reception thereof. While the ribs 15 are not essentialto prevent lateral movement of the shoes, as they are held by thefastening at each end, it is desirable in some cases to employ the ribsto prevent strain on the fastening devices.

We claim herein as our invention- 1. The combination of a cam, aremovable shoe or wearing-plate, and means for locking the shoe to thecam and constructed to take up any stretch or elongation of the shoe,substantially as set forth.

2. The combination of a cam having two wings or operative portions,wearing-plates or shoes. provided with hooks for engaging the ends ofthe wings, and means for adjustably securing the opposite ends of theshoes in position, substantially as set forth.

3. The combination of a cam having two wings or operative portions,Wearing-plates or shoes provided with hooks for engaging the ends of thewings, locks for holding the hooks in position, and means for adjustablysecuring the opposite ends of the shoes in position, substantially asset forth.

4. The combination of a cam having wings or operative portions,wearing-plates or shoes provided with hooks for engaging the ends of thewings, wedge-like pins for drawing the shoes against the faces of thewings, and keys for drawing the pins in, substantially as set forth.

5. The combination of a cam having two wings or operative portions,wearing-plates or shoes provided with hooks for engaging the ends of thewings, and Wedges engaging. the wings and projections on the oppositeends of the shoes, substantially as set forth.

In testimony whereof we have hereunto set our hands.

GEORGE W. BORROWVE. GEORGE E. VVINSLOW.

Witnesses as to George WV. Borrowe:

R. O. TURNER, C. F. HECTOR.

Vitnesses as to George H. \Vinslow:

F. E. GAITHER, DARWIN S. WoLooTT.

